31
Technical Area / Re: Taito PCB identification.
« on: September 02, 2015, 07:21:47 AM »
There's a MONACO GP workshop at Eurocade? 
News:
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32
'Business' Area : Buy/Sell/Trade / Re: French ebay and "Le Bon Coin"
« on: August 31, 2015, 07:28:38 AM »Thats...different... quite like the demo kiosks you see in stores.
That IS a demo kiosk from back in the days.
33
Technical Area / Re: Multivector project
« on: July 22, 2015, 06:05:14 PM »I'd switch them all.....you never know what happens If voltages are fed back to circuits that are supposed to output voltages....
I suppose diodes would do a sufficient job in protecting and separating these circuits, though, wouldn't they? Much easier to handle than to actively switch stuff. Or am I missing something?
34
'Business' Area : Buy/Sell/Trade / Re: WTB: Monaco GP cocktail
« on: July 21, 2015, 09:27:31 AM »very interesting Dirk....The things you mention don't scare me off......a non-working PCB probably will
Still interested though, let's see when I see the pics
Actually, it's three PCBs (1 x logic, 1 x video, 1 x sound), and they're all huge and "strictly TTL" - no CPU on there. So debugging them is a nightmare, I've been through this
. On the other hand, I do now have a ton of spares for this game, so I'm happy to help if you dare take the risk 
35
'Business' Area : Buy/Sell/Trade / Re: Yahoo Auction...in Japan!
« on: July 20, 2015, 05:02:28 PM »
I was outbid a minute before the end - I was using Japamart as a bid proxy.
Unfortunately, it takes them a few minutes to add new funds, so I had no time to increase my bid.
Unfortunately, it takes them a few minutes to add new funds, so I had no time to increase my bid.
36
Arcade Lifestyle / Re: Home-Arcade Video- and Picture-thread 2015
« on: July 19, 2015, 09:03:44 PM »Very nice collection you have bela
Indeed. I thoroughly enjoyed visiting Bela in June, and having the opportunity to see all this in person. This rules.
37
'Business' Area : Buy/Sell/Trade / Re: WTB: Monaco GP cocktail
« on: July 18, 2015, 08:01:01 PM »Andre. I m sorry but i have to tell you there aren t other known instanves of that cocktail table
Oh, yes, there are
. In fact, at least two of these have popped up for sale on the AZ forum over the years. I can dig up the PMs with photos if that's of interest ...Here's the corresponding threads:
http://www.arcadezentrum.com/forum/showthread.php?24313-Monaco-GP-cocktail-in-Darmstadt-f%FCrn-Appel-undn-Ei&highlight=monaco+gp+cocktail (that one went for 40(!!) euros this year!)
http://www.arcadezentrum.com/forum/showthread.php?2314-Wusste-gar-nicht&highlight=monaco+gp+cocktail
But anyway, i have to agree with you: Monaco GP is a GREAT game. I've owned the Pro version for a few years now, and only recently got my hands on the cabaret, after hunting for a good one for quite some time.
38
Arcade Lifestyle / Re: Robo-Cab
« on: July 17, 2015, 07:00:00 AM »Very nice! Do the eyes light up?
Yes, they do. One 12V bulb in each of them.
39
Technical Area / Re: Galaxian bad ram 1 unusual
« on: July 14, 2015, 05:54:44 PM »
Never mind, I found how to disable the wachtdog. It's cleary shown in the schematics - RTFM also applies to old games, it seems
40
Arcade Lifestyle / Re: Robo-Cab
« on: July 14, 2015, 05:46:04 PM »
And the beast arrived today ... 
Very clean on the inside and outside. The monitor is a Nanao MC1400, which seems to be somewhat uncommon. Fortunately, the original manual and schematics for it are in the cab, as they don't seem to be available online yet (some folks over at the KLOV forums are obviously searching for them), so: scanning time
Very clean on the inside and outside. The monitor is a Nanao MC1400, which seems to be somewhat uncommon. Fortunately, the original manual and schematics for it are in the cab, as they don't seem to be available online yet (some folks over at the KLOV forums are obviously searching for them), so: scanning time
41
Technical Area / Re: Galaxian bad ram 1 unusual
« on: July 14, 2015, 04:23:27 PM »
While waiting for the beformentioned RAMs: does anyone know what's the correct way to disable the watchdog on Galaxian? I've read about two solder pads near the program rams that need to be connected for this, but the troubleshooting manual doesn't say anything on that.
I suppose it's not sufficient to just lift pin 26 of the CPU, and then ground it to put the Z80 into a reset/initial state, right? As the reset line should be pulled high after that, from what i see.
Thanks again for your inputs!
Martin
I suppose it's not sufficient to just lift pin 26 of the CPU, and then ground it to put the Z80 into a reset/initial state, right? As the reset line should be pulled high after that, from what i see.
Thanks again for your inputs!
Martin
42
Technical Area / Re: Galaxian bad ram 1 unusual
« on: July 12, 2015, 07:42:58 AM »
You are referring to the 2700s on 1N - 1T, right? No, they don't.
Yeah, me too ... these are the RAMs in row 1, next to the character eproms. Or am I missing something?
Reg. leaking caps: yes, I was thinking about this, too, but from a quick look into the schematics, the only cap directly involved here is the small ceramic cap right after the crystal - and this one is definitely good. Also, the 5V line itself looks steady and good on my scope.
But I'll check again today - many thanks for the hint, though!
43
Arcade Lifestyle / Re: Restoration of a Seeburg SMC1 (disco 160) Jukebox
« on: July 11, 2015, 08:53:13 PM »
Btw., to put my reference to my Rock Ola from the other thread into perspective: I think it's pretty cool you're going for one of the newer jukebox "underdogs" - I wouldn't mind having one of these around as well (or, if it has to be a 70s model, one of the Atari boxes ).
Good luck with that project!
Store-wise, I can wholeheartedly recommend Stamann Jukeboxes. While not dutch, they do produce and carry only highest quality spares.
http://www.jukebox-world.de/
).Good luck with that project!
Store-wise, I can wholeheartedly recommend Stamann Jukeboxes. While not dutch, they do produce and carry only highest quality spares.
http://www.jukebox-world.de/
44
Technical Area / Re: Galaxian bad ram 1 unusual
« on: July 11, 2015, 08:02:07 PM »Do all the RAMs on the bottom right edge have heat sinks ?
You are referring to the 2700s on 1N - 1T, right? No, they don't.
That's how the board came, and as it was working before the RAM error occured, I supposed(d) it's fine that way. I did suspect these as well, though (see my first post), and will hopefully receive a new set of 2701s from Andreas / Speleo next week (2701s should work fine as well here)
Martin
45
Technical Area / Re: Galaxian bad ram 1 unusual
« on: July 11, 2015, 07:03:18 PM »
Unfortunately, fixing the "Bad Ram 1" error only brought up the next problem:
While letting the game run for a while with the test rom, it started to freeze. After a few hours of cooldown, things were back to normal. However, everytime I let it run for more than a few minutes, the freezes returned. And not only did they return, they got more and more frequent.
I checked around with my scope, and what happens, is that the 6 Mhz and Clock signals get more and more noisy, until they more or less disappear - with this, there's obviously no video sync, and the CPU stops running properly.
Tracing the signals starting from the crystal, here's what I found:
- The crystal is pulsing fine all the time
- Signals look ok until they leave the 74368 at 1E
- The outputs of the 74107 at 1D are very noisy already, even though the IC is known good (I swapped in a new one, as I did with the 74368)
- Just for the heck of it, I also swapped the other ICs involved in the signal handling here (the 7474 at 1C, the 7420 at 3C), so they're also known good
I suppose there's something along the bus delivering the CLK signal that's creating that noise. My initial suspects where the 74161 at 3A and 4A, but I've swapped these as well with new ones, with no change.
As an added riddle: as I can leave the PCB off for a few hours, and things will work again for a few minutes then, I thought of heat related issues with one of the ICs. However, none of them gets hot, and also using freeze spray on any IC that's slightly warm does not change a thing - only powering down the game for a few hours restores a working state for a very short time.
Any hints from the experts out there are obviously very welcome
Cheers,
Martin
While letting the game run for a while with the test rom, it started to freeze. After a few hours of cooldown, things were back to normal. However, everytime I let it run for more than a few minutes, the freezes returned. And not only did they return, they got more and more frequent.
I checked around with my scope, and what happens, is that the 6 Mhz and Clock signals get more and more noisy, until they more or less disappear - with this, there's obviously no video sync, and the CPU stops running properly.
Tracing the signals starting from the crystal, here's what I found:
- The crystal is pulsing fine all the time
- Signals look ok until they leave the 74368 at 1E
- The outputs of the 74107 at 1D are very noisy already, even though the IC is known good (I swapped in a new one, as I did with the 74368)
- Just for the heck of it, I also swapped the other ICs involved in the signal handling here (the 7474 at 1C, the 7420 at 3C), so they're also known good
I suppose there's something along the bus delivering the CLK signal that's creating that noise. My initial suspects where the 74161 at 3A and 4A, but I've swapped these as well with new ones, with no change.
As an added riddle: as I can leave the PCB off for a few hours, and things will work again for a few minutes then, I thought of heat related issues with one of the ICs. However, none of them gets hot, and also using freeze spray on any IC that's slightly warm does not change a thing - only powering down the game for a few hours restores a working state for a very short time.
Any hints from the experts out there are obviously very welcome
Cheers,
Martin